<?php

/**
 * This is the model class for table "{{tags}}".
 *
 * The followings are the available columns in table '{{tags}}':
 * @property integer $id
 * @property string $name
 * @property integer $count
 * @property integer $odr
 * @property integer $dateline
 */
class Tags extends CActiveRecord
{
	/**
	 * @return string the associated database table name
	 */
	public function tableName()
	{
		return '{{tags}}';
	}

	/**
	 * @return array validation rules for model attributes.
	 */
	public function rules()
	{
		// NOTE: you should only define rules for those attributes that
		// will receive user inputs.
		return array(
			array('name, count, odr', 'required'),
			array('count, odr, dateline', 'numerical', 'integerOnly'=>true),
			array('name', 'length', 'max'=>25),
			// The following rule is used by search().
			// @todo Please remove those attributes that should not be searched.
			array('id, name, count, odr, dateline', 'safe', 'on'=>'search'),
		);
	}

	/**
	 * @return array relational rules.
	 */
	public function relations()
	{
		// NOTE: you may need to adjust the relation name and the related
		// class name for the relations automatically generated below.
		return array(
		);
	}

	/**
	 * @return array customized attribute labels (name=>label)
	 */
	public function attributeLabels()
	{
		return array(
			'id' => 'ID',
			'name' => 'Name',
			'count' => 'Count',
			'odr' => 'Odr',
			'dateline' => 'Dateline',
		);
	}

	/**
	 * Retrieves a list of models based on the current search/filter conditions.
	 *
	 * Typical usecase:
	 * - Initialize the model fields with values from filter form.
	 * - Execute this method to get CActiveDataProvider instance which will filter
	 * models according to data in model fields.
	 * - Pass data provider to CGridView, CListView or any similar widget.
	 *
	 * @return CActiveDataProvider the data provider that can return the models
	 * based on the search/filter conditions.
	 */
	public function search()
	{
		// @todo Please modify the following code to remove attributes that should not be searched.

		$criteria=new CDbCriteria;

		$criteria->compare('id',$this->id);
		$criteria->compare('name',$this->name,true);
		$criteria->compare('count',$this->count);
		$criteria->compare('odr',$this->odr);
		$criteria->compare('dateline',$this->dateline);

		return new CActiveDataProvider($this, array(
			'criteria'=>$criteria,
		));
	}
	
	/**
	 * (non-PHPdoc)
	 * @see CActiveRecord::beforeSave()
	 */
	public function beforeSave(){
		$this -> dateline = time();
		return true;
	}

	/**
	 * Returns the static model of the specified AR class.
	 * Please note that you should have this exact method in all your CActiveRecord descendants!
	 * @param string $className active record class name.
	 * @return Tags the static model class
	 */
	public static function model($className=__CLASS__)
	{
		return parent::model($className);
	}
	
	public static function string2array($tags)
	{
		return preg_split('/\s*,\s*/',trim($tags),-1,PREG_SPLIT_NO_EMPTY);
	}
	
	public static function array2string($tags)
	{
		return implode(', ',$tags);
	}
	
	public function updateFrequency($oldTags, $newTags)
	{
		$oldTags=self::string2array($oldTags);
		$newTags=self::string2array($newTags);
		$this->addTags(array_values(array_diff($newTags,$oldTags)));
		$this->removeTags(array_values(array_diff($oldTags,$newTags)));
	}
	
	public function addTags($tags)
	{
		$criteria=new CDbCriteria;
		$criteria->addInCondition('name',$tags);
		$this->updateCounters(array('count'=>1),$criteria);
		foreach($tags as $name)
		{
			if(!$this->exists('name=:name',array(':name'=>$name)))
			{
				$tag=new Tags('create');
				$tag->name=$name;
				$tag->count=1;
				$tag->save();
			}
		}
	}
	
	public function removeTags($tags)
	{
		if(empty($tags))
			return;
		$criteria=new CDbCriteria;
		$criteria->addInCondition('name',$tags);
		$this->updateCounters(array('count'=>-1),$criteria);
		//$this->deleteAll('count<=0');
	}
	
	/**
	 * 更新计数器
	 * @param unknown_type $id
	 */
	public function updateCount($id){
		
	}
	
}
